This study provided quantitative analyses from several aspects of signal timing related to bandwidth optimization,including: the influence of signal phasing sequence,the impact of intersection spacing,and the impact of number of signals in a system.A large number of arterial scenarios were randomly generated to simulate 90 000 traffic signal systems that likely exist in the real world.After comparing the effectiveness of four phasing sequences,it was concluded that lead-lag or lag-lead phasing sequence was used 5% more than leading or lagging.The impact of intersection spacing was analyzed by comparing uniformly and randomly spaced signal systems.Uniformly spaced signal systems did not provide better progression bandwidth than non-uniformly spaced systems.The study also found that the number of signals had a significant impact on bandwidth attainability.When the number of intersections exceeded 16,there were practically no two-way bandwidth solutions,suggesting that bandwidth based signal timing approach may not be feasible.